balanced_numbers.rb

require 'pry'

def balanced_num(number)
  # my arrays
  number_array = number.to_s.chars.map(&:to_i)
  lower_array = []
  higher_array = []
  # get the index positions that i need
  if number_array.length.odd?
    middle_number = number_array.length / 2
    # push values lower than index into lower array and higher values into higher array
    number_array.each_with_index do |number, index|
      if index < middle_number
        lower_array << number
      elsif index > middle_number
        higher_array << number
      else
        nil
      end
    end
    #sum the two arrays and return balanced or not balanced
    if lower_array.sum == higher_array.sum
      answer = "Balanced"
    else
      answer = "Not Balanced"
    end
  else
    # get the index positions that i need
    middle_number_upper = number_array.length / 2
    middle_number_lower = middle_number_upper - 1
    # push values lower than index into lower array and higher values into higher array
    number_array.each_with_index do |number, index|
      if index < middle_number_lower
        lower_array << number
      elsif index > middle_number_upper
        higher_array << number
      else
        nil
      end
    end
    #sum the two arrays and return balanced or not balanced
    if lower_array.sum == higher_array.sum
      answer = "Balanced"
    else
      answer = "Not Balanced"
    end
  end
  return answer
end

p balanced_num(224222)

# if the array has even length (3547) then there are two middle digits
# if the array has odd length (234) then there is one middle digit
# try to extract the middle digits, then based on its index sum everything below this and above this